Module { } stdlib/bhc-transformers/hs/BHC/Control/Monad/Trans.hs Trans Type Classes class MonadTrans t { } # Methods lift :: (Monad m) => (m a) -> t m a class Monad m => MonadIO m { } # Methods liftIO :: (IO a) -> m a Class of monads that can perform IO. Instances instance MonadIO IO { }